Isotherm, Kinetics and Thermodynamics of Cu(II) and Pb(II) Adsorption on Groundwater Treatment Sludge-Derived Manganese Dioxide for Wastewater Treatment Applications

doi:10.3390/ijerph18063050

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Title:	Isotherm, Kinetics and Thermodynamics of Cu(II) and Pb(II) Adsorption on Groundwater Treatment Sludge-Derived Manganese Dioxide for Wastewater Treatment Applications
Authors:	Tumampos, Stephanie B. Ensano, Benny Marie B. Pingul-Ong, Sheila Mae B. Ong, Dennis C. Kan, Chi-Chuan Yee, Jurng-Jae de Luna, Mark Daniel G.
Contributors:	Univ Philippines Diliman, Natl Grad Sch Engn, Environm Engn Program Dong A Univ, Univ Core Res Ctr Disaster Free & Safe Ocean City Univ Philippines Visayas, Sch Technol Chia Nan Univ Pharm & Sci, Inst Hot Spring Ind Dong A Univ, Dept Architectural Engn Univ Philippines Diliman, Dept Chem Engn
Keywords:	groundwater treatment sludge heavy metal adsorption isotherm kinetics manganese dioxide thermodynamics
Date:	2021
Issue Date:	2023-11-11 11:54:03 (UTC+8)
Publisher:	MDPI
Abstract:	The ubiquitous occurrence of heavy metals in the aquatic environment remains a serious environmental and health issue. The recovery of metals from wastes and their use for the abatement of toxic heavy metals from contaminated waters appear to be practical approaches. In this study, manganese was recovered from groundwater treatment sludge via reductive acid leaching and converted into spherical aggregates of high-purity MnO2. The as-synthesized MnO2 was used to adsorb Cu(II) and Pb(II) from single-component metal solutions. High metal uptake of 119.90 mg g(-1) for Cu(II) and 177.89 mg g(-1) for Pb(II) was attained at initial metal ion concentration, solution pH, and temperature of 200 mg L-1, 5.0, and 25 degrees C, respectively. The Langmuir isotherm model best described the equilibrium metal adsorption, indicating that a single layer of Cu(II) or Pb(II) was formed on the surface of the MnO2 adsorbent. The pseudo-second-order model adequately fit the Cu(II) and Pb(II) kinetic data confirming that chemisorption was the rate-limiting step. Thermodynamic studies revealed that Cu(II) or Pb(II) adsorption onto MnO2 was spontaneous, endothermic, and had increased randomness. Overall, the use of MnO2 prepared from groundwater treatment sludge is an effective, economical, and environmentally sustainable substitute to expensive reagents for toxic metal ion removal from water matrices.
Relation:	INT J ENV RES PUB HE, v.18, n.6, pp.3050
Appears in Collections:	[Taiwan Hot Spring Research Center] Periodical Articles

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